Drafting implement



i 1937- J. c. HOCHM A N 2,080,917

DRAFTING IMPLEMENT Filed Feb. 15, 1933 mill-II] ATTORNEYS Patented May18, 1937 UNI TED STATES PATENT F F16 E- DRAFTING' IlVIP-LEMENT Julius G.HochmamNew York, N. Y., assignor to Eagle Pencil Company, a=corporationofDelaware Application-February 15, 1933, Serial-No. 656,776

passes ofthe particular type disclosedin-the prior patent toGeorge-Oberbeck, 730,388; of June 9,- 1903; a construction, of which many;thousands 5' have" been made and marketedinthe United States-during thepast thirtyyears.

Amongthe'particular objects of the present invention,- are toreducethe-costof manufacture bymaking the deviceof a reduced numberofstampings and facilitating the assembly thereof,

yetaffo'rding'a construction of enhanced rugged:

n essless likely toget out of order with superior" frictionclutching-action for each setting of the;

, legs and-of improved appearance.

part pointed outhereinafter;

In-the accompanying drawing in which are shown one or-more ofthe-various possible embodiments of the several features of theinvention,

Fig; 1 is a side-view on an enlarged'scale of apreferred embodiment ofthe compass;-

Fig; 2' is atransverse view-onthe line 22- of Fig. l;

lication of the rivet;

Fig. 4-is a transverse sectional view-on the line 4-4 of Fig. 1;

' 0 views respectively along-thelinesB-S; 6'-6; '|T,

Fig, 9 is a perspective view of the handle web unit-.f

Referring now to the drawing the compasses -5- comprise a-pair'of-legsHI and H of sheet metal,

preferably sheet steel; These legs in the preferred embodiment are ofwidened area at their upperor pivot ends and each has an outwardlyextending-flat embossed area l-Z affording a nar- Thehandle member I I-on the compass has unitary therewitha webpiece l5 interpose'd betweenthe widened areas of the'respective legs and preferably completelycovered by said widened areas; To retain the three elements,

45- namely, the two legs lfland Ilandthe interposed web 15, ofthe handlemember in assembled relation, a rivet I6 is preferably employed, theheads of" which rest in corresponding. countersinks I1? and E8 in therespective widened em- 50 bossments of the legs, said rivet,whenztightened,

as shown infFig. 2, drawingthe-countersunkportion as originally spacedfrom the web, as at I9,- into frictionclutch-relation-with but slightclearance from the opposite faces ofweb l5-as at 20 55 in.Fig; 2. Thuswhile the embossments serveto Other objects will be inpart obvious andin;

Fig; 3 is a view similar to Fig; 2 prior toap- (CL: 33-i-151) stiffenthelegs; as desired, the widened area about therivetserves-the additionalfunction-of a resilient friction washer and an improved frictionclutchaction is thus provided, without resort to washers, springs'orotherauxiliary pieces for that purpose.

Preferably, the web stamping hasv integral; therewith a cylindricalcollar mount 22 which.

is formed by bending about a mandrel- (not shown) a rectangularextension unitary Withthe web. Over the said cylindrical mount. thereis.

frictionally telescoped an ornamental handlecap member l4 which may beof drawn metal andmay exert a clamping fit to: partly close-up the gap23 in the split. cylinder 22 and afford a particularly effectivefriction. mount.

Centering means is provided to retain the han-.

dle mount at,all times in symmetrical position with respect to. thecompass legsregardless of they radius forrwhich the latter are set. Forthis purpose the legs are associated with respect to Web l5, by coactingtrack and runner elements generically of, the type of the Oberbeck.patent, butofj improved character.

In-apreferred embodiment the web I5 is provided with a pair of arcuateslot segments 26 and- 2T symmetrical with respect tolthe axis of the weband'eccentric with respect. to the rivet l6. Each compass leg has arunner stud ZBunitar-y; therewith, said studs protruding into therespective slot segments 26 and-21. pieces may be separate elementsscrewed or forced into corresponding apertures in the legs, it ispreferred to form said studs integrally" with the respective legs, by asimple-swaging operation, best. suggested in Fig. 4. A punch (notshown)- of diameterlarger' than said stud effects a depression 30 in themetal of the leg and" thus forces outwardly from the opposite face ofthe leg the protruding stud 28' integral therewith; As best shown inFig. l the stud for each leg is located at the rim thereof, which rim islocally widened as at 3| and the embossed area l2 correspondinglynarrowed or notched to accommodate such stud. The studs extending fromthe two legs into the respective segment slots of the web plate aresymmetrical with; respect to each other, so that the handle knob l4necessarily remains in symmetrical position, with respect to the legsregardless for what radius the latter. are set.

By the arrangement set forth,- the segment plate and its slots arecompletely concealed'by the widened areas of the respective legs attheir While the stud respective pivot ends so that these parts are notreadily tampered with.

Slot segments 26 and 21 being eccentric with respect to the rivet IS,the aperture for the rivet l6 through the web plate I5 is elongated asat 44 to permit the web with the handle M to ride upward or downward asthe arms are adjusted in position.

One of the legs H is preferably provided with an integrally extendingunitary arc piece 35 concentric vvith the pivot, in the plane of the rimof said arm and bearing scale markings 36 for radius setting. The otherleg I!) is provided with a scale reading or gauging tongue 31 integraltherewith bent downward through the, thickness of the web plate l5, andfor frictional engagement With the scale 35. By this relation theeffectiveness of the pivot clutch is aided in maintaining the compass insaid position.

The centering point of the compass may be a stylus 38 frictionallyretained in a split sleeve 39 formed at the end of the corresponding armID. The pencil 40 may be retained in a split sleeve 4| unitary with theother arm I I and may be clamped in position by a clutch which by itselfis not my invention but included in the subject-matter of the copendingapplication of Benjamin W. H'anle, Serial No. 636,598, filed October 6,1932 now PatentNo. 2,045,298, issued June 23, 1936. The clutchaccordingly need not be described at length. It may be briefly notedthat the clutch wedging member comprises a yoke piece 42 with inturnedears 43 fitting into apertures 44 of converging ears 45 unitary with thesleeve 4|.

As shown in Fig. 1, the handle knob l4 may be of a polygonalcrosssection harmonizing with the generally angular modernistic effectof the entity.

While the invention has been shown applied to a pair of compasses, itcould, of course, be applied with equal effectiveness in a dividerembodiment.

It will thus be seen that there is herein described apparatus in whichthe several features of this invention are embodied, and which apparatusin its action attains the various objects of the invention and is wellsuited to meet the requirements of practical use.

As many changes could be made in the above construction, and manyapparently widely different embodiments of this invention could be madewithout departing from the scope thereof, it is intended that all mattercontained in the above description or shown in the accompanying drawingshall be interpreted as illustrative and not in a limiting sense.

Having thus described my invention. what I claim as new and desire tosecure by Letters Patent is- 1. A pair of compasses comprising legmembers each comprising a unitary blank widened at its pivoting end, ahandle member having an integral web interposed between said widened legmembers, a rivet retaining said members in assembled relation, andsymmetrically arranged track and runner stud means serving to center theWeb with respect to the legs, said track means being elongated, curvedand eccentric with respect to said pivot, both the track and the freeend of the coacting runner stud members being completely covered by thewidened portions of the compass legs.

2. A pair, of compasses comprising stamped metal leg members widened attheir pivoting ends, a handle member having a web unitary therewith andinterposed between said widened leg members, a rivet retaining saidmembers in assembled relation, and symmetrically arranged track andrunner stud means serving to center the web with respect to the legs,said track means being elongated, curved and eccentric with respect tosaid pivot, said track means being disposed within the thickness of saidweb and the runner studs protruding inward toward the web from portionsof the legs which are imperforate.

3. A pair of compasses including three stamped elements including twolegs and a handle having a web unitary therewith and interposed betweensaid legs, a rivet retaining said members in assembled relation andaffording a pivot for said legs, symmetrical elongated arcuate tracksegments extending into the metal of said web, and runner studsprotruding from the respective legs into the respective track segments,said legs being imperforate at the region of said runner studs.

4. A pair of compasses comprising three stampings, including a pair oflegs and an intervening web having a handle member unitary therewith andprotruding above said legs, said legs widened to completely cover saidweb, a rivet through said legs and said web, elongated arcuate trackslots through said web symmetrically arranged and eccentric with respectto said rivet, and runner studs integral with the respective legs andswaged inward therefrom to protrude into the respective track segments.

5. A pair of compasses including a pair of leg stampings widened attheirhandle ends having the main area thereof embossed outward to afford arelative wide raised area near the handle ends, a web interposed betweensaid legs and having a handle knob unitary therewith and a rivet throughsaid widened embossments forcing the areas thereof inward for frictionclutch action. V

6. A pair of compasses including a pair of leg stampings widened attheir handle ends, having the main areas thereof embossed outward toafford a relatively wide raised area near the handle ends, a webinterposed between said legs and having a handle knob unitary therewithand. a rivet through said widened embossments forcing the areas thereofinward for frictional engagement, runner studs protruding toward the webfrom beyond the embossed areas of the respective legs and track segmentsin said web symmetrically arranged and accommodating the respectiverunner studs.

7. A pair of compasses including sheet metal leg members widened nearthe handle, said leg members having the main central areas thereofembossed outward to afford a fiat surface raised with respect to therims of said legs and of substantial width near the handle end, saidrims locally widened and said embossed areas correspondingly narrowed,runner studs swaged inward from the widened rim regions, said webportion having track segments symmetrically arranged and accommodatingthe respective studs, and a rivet through the embossed widened areas ofthe respective legs and the interposed web drawing said embossed areastoward said web for friction clutch action.

8. A pair of compasses including sheet metal legs, an interposed webhaving a handle knob unitary therewith, and a rivet connecting saidelements together, each of said legs having a stiffening web embossedtherein and a plane rim, an arcuate scale concentric with said rivet,integral with one of said legs and substantially in the 1ane of saidrim, the companion leg having a gauging tongue protruding therefrom andbent through substantially the thickness of said web for snug engagementwith the arcuate scale.

9. As an article of manufacture, a compass leg including a sheet metalstamping of widened area at its pivot end, having a flat outwardembossment affording a narrow peripheral rim, said rim locally widenedand said embossment correspondingly reduced at said area, and a studswaged inward from said widened region of the rim.

10. A pair of compasses of the type including pivoted legs and anoperating handle, said handle comprising a stamping including a webinterposed between said legs, and a split tube portion unitary with saidweb and a handle cap frictionally telescoped over said tube portion.

11. A pair of compasses including sheet metal legs, an interposed webhaving a handle knob unitary therewith, centering means between the weband the respective legs to maintain the handle knob symmetrical withrespect to said legs in all positions of adjustment of said compass, arivet connecting said legs and web together and exerting friction clutchaction, an arcuate scale concentric with said rivet and integral withone of said legs and a tongue integral with the other of said legs andbent out of the plane of said. legs through substantially the thicknessof said leg to contact and exert a friction clutching action againstsaid arcuate scale.

JULIUS C. HOCHMAN.

